[digger89L]

Have you replaced the radiator cap? Could be something that simple. Also, take it to a shop and have them pressure test the system to see if its developing the proper pressures / temperatures to open the thermostat and operate the thermo-switches. You knew about the thermo-switches, right?See here (page 3-3) http://www.honda.co.uk/owner/LegendCoupe/62sg000/3-2.pdf for the proper specs, and here for cap and rad pressure testing: http://www.honda.co.uk/owner/LegendCoupe/62sg000/5-49.pdf and here for location of the thermo-sensor: http://www.honda.co.uk/owner/LegendCoupe/62sg000/5-46.pdf